Thanks - I had not noticed that.

I actually thought of something similar as I recalled that I years ago inspired by Ansel Adams tried to calibrate my black and White developing process to recreate a similar stepwedge

Thanks Robl for your comment.

I am quite confident in how to handle the images and use mainly the same tool you mention.

My question was mostly on how to set the overall lightness - and not necessarily for printing as most of my images end being seen on the web.

Thanks Peter for your thorough response. I will try out some of your suggestions.

It also made me think of another issue. I use RawTherapee for developing. In the editor image is perhaps like 20% of screen surface while the rest by default is toolbars and the like on completely black background. Should one perhaps better change the black background to some "average grey" to be able to better judge the right lightness of the picture? (I do not know whether it is possible though)

When "devoloping" raw pictures I am being troubled in finding the right level on exposure or "lightness".

It often ends up being a job done in the evening with no daylight and when setting exposure as I think it should be on the PC screen I realize next day in daylight that pictures now seems to dark. I have now tried to do the work with as much electric light turned on but still feel unconfident in the process.

Support at a company making photo books told me that setting my PC screen lightness to only 50% would resemble the look of their prints.

To sum up: How do you develop? In full daylight? With PC screen lightness at max or how do you do?

Just realized that by zooming fully in I can actually see the spring being in place as it should be

Some something else must be bent or something like that. Had it been some other sort of mechanics I may have tried some oil....

Now I think I will go for buying the secondhand unused lens as price is just Dkr 500 (67€ or $).

Perhaps I can negotiate price a little

Thanks - I think I will try with whatever small screwdriver I have. Buying a JIS screwdriver set will cost more than half of what I can buy a secondhand unused similar lens for not far from where I live.

And I am not sure I can fix the one I have.....

Wow - the internet can still amaze me

Do you mean the screws I have marked on the photo below? (there are 4 of those, where 2 of them sit very close to each other)

In Denmark wages are to high for sending a lens like this for repair. Cheaper to buy a new.

Have anybody tried themselves to disassemble a lens? And assemble it again also of course

Just adding: I can by hand manipulate the slider and see the aperture change inside the lens. But it doesn't jump back to fully closed as another lens I have.

Perhaps a spring broken/fallen off?